Sulfate Corrosion-resistance Admixtures for Concrete (FFS-1）

Description

Because of sulfate and magnesium in seawater or saline and alkaline area, there are damaging effects of chemical corrosion for cement and concrete. Chloride and sulfate also have corrosion and damaging effects for reinforced concrete. So for concrete, the anti-corrosive measures must be taken to. When added during concrete mixing, it is resistant to sulfates and aggressive substances, and improves the durability of concrete. It is called sulfate corrosion-resistance admixture for concrete. Its abbreviation is sulfate corrosion inhibitor.

Typical Properties

Item			Standard Indicators	Actual Results
Chemical Composition	MgO /, %		≤5.0	2.63
	Chloride /%		≤0.05	0.01
Physical Properties	Specific surface area /（㎡/㎏）		≥300	439
	Setting time	Initial setting /min	≥45	50
		Final setting / h	≤10	2.9
	Compressive strength ratio /%	7 day	≥90	94
		28 day	≥100	105
	Expansion rate /%	1day	≥0.05	0.07
		28 day	≤0.60	0.54
Corrosion resistance	Corrosion resistance coefficient（K）		≥0.85	0.88
	Expansion coefficient（E）		≤1.50	1.3

Applications

1) If sulfate corrosion-resistance admixture for concrete is added into Portland cement mortar or concrete, it can be resistant to a certain concentration of SO42-, Cl-, HCO3-, CO2, NH4-, Mg2 + and other salts in the environment ,and pantothenic groundwater, surface water, sea water, sewage, saline soil, soluble rock salt, other corrosive substances for mortar or concrete.
2) If the sulfate corrosion-resistance admixture for concrete is added into silicate cement mortar or concrete, it can be used in the erosion environment of harbor, water conservancy, sewage, underground tunnel, water diversion, road, bridge, industrial and civil building infrastructure.

Main technical indicators

Dosage:

6-12% of cement weight.